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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd55d2ae8cef6716f0fd385dbee8fdf0629ed78fb3162e9250e0657dde27c3b93' 
  AND token = '7MpSFhkrYzF1JSZVOe7rUTJEnpsziKp1QPqbbFEH8/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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