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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e18ff4ab2103bbc550762ce4e777acaf1e493a9d177779e14d76f5b73d8f5123' 
  AND token = 'rPlFaPkyLzaA3WnG8wtVoR6xTCg+j0bTC5OqldSh2jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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