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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b45f7a535846ceee95fc0e60418036185c8f6847b0f20983a9fe728bea0cd9' 
  AND token = 'kIA25C7IIF3D5Q5Fg6Ttqkp9VWxq/Trz8aD25JjVaNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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