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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f8751fde9fa70fdf90daf2afeeecd8897cd7c424cfff4e8ac47f9e41503c27' 
  AND token = 'Iet1bHqkXfZjDmudKo4byj86PlPakOwM0mpHe4Yu3AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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