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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f95f23f949f697b4a588485e5ac94f5c56a1aa079da8738f13137e6bae1e1de' 
  AND token = 'qZ3TqgPcPCANbMVXhfiwp1cYa2BAe4T27PtE/ZHHdfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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