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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e32c74efdd26cea5f17ee97718e7197d4e63e8d7366d2638c17c8ac71b29fed' 
  AND token = '2eKxWA/ecVkITSmorGZz2KPEaB25aFsoiLozfc57Tec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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