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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '253441de8d7a611dafe59e8e64f8f450153187b4b4ea8264c7c2c4c6f5c03eb3' 
  AND token = 'CrZj601xndGb+NSA559kkcubefCaHd4mh+RW/8RPAOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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