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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a4f80d4631606ac6b3227df1b64f17d25dbf088aebf581438d13ca165615fe9' 
  AND token = 'DPLLFeh9e6GDQzgIzsK5RTI5VA6qsbsi8CTGbvzzJxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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