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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee873be8a2cba2ef2b4c229eb4f8e5ab54d7176ce86496eb6181aa9ffe290472' 
  AND token = 'C3/RvIdtkzTVPBuD4WBASGg2l30SIW6dGYVAInlFZwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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