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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce04f7b1e114c59d32bd3ff6cbd6d4b7e1a46cbe48d9ae179143042c33fe57f' 
  AND token = 'IdqWr9vEZSM3FsfuHhAtADz3I1ViUhYC/YSMVUOout8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}