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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475112ab951e7137dafbadb6b5171689569bd0a5a944331d6697a662abe3375b' 
  AND token = '8h2TFAFpTCes8R0vrQoqr+pg5AtVaQTYCA5kL/BiUkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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