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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd237f312c259458fa640aa1335971ba075d325f3faf3e416eb03a0f916ed174e' 
  AND token = '7mIo+KxfkfqFfBzRTG1KrazKYSosTmJhu7eMwpom17E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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