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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2485d44d8fb9071d790dafb001a4f0e5d9d27f18c6ad0ce6dbfb32c1337e5c2' 
  AND token = 'zwq37tYiwSBd3DK3OPXTM1IXeSW94Cau4NXdG75ps/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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