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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a5c7d843cb64a1696fad68992ba254299d3ecf4745ef1dfcd0ab204972e5dd' 
  AND token = 'cXjyR+6Fx+XEtXO8dC32fNSjoD2Fk96A2qfZHOkOO5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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