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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdb82d08a8d7eea5bf80ee54c7d67993e39a4811eeee6b6f6d1823024a0f2a7' 
  AND token = '0jAKAe90Dbb1McGfbd05gk7G2/9hVVT7F22eYFZTETY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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