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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c2cd7441004fa2e258bba12e32cec8b4bb8eef7a7d4859aa6dfb16474b6b96' 
  AND token = 'Pt7rIHR3XrRXL9r7sBbD6w5ewSf/NdCxmGSpkdba+6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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