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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5956fc7423f66818ac281d0319cc02abec01750b073e9fac4244448e80a631' 
  AND token = 'U7E36pfQPCA3sEGLnhmPB6UzyyuFm11XvleUz9dXw0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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