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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ecb25ca5a5db8ba69b27a6d25518a0172dfdc3b3b698d7a841dc98196ba5c2' 
  AND token = '/p9CpWBs2eLQmJXevmC2yCDI0X7HhCx25PzoMtEHUoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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