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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86bb0aa2611012e2979ef5f54f44ee4edb095b0b737ca7709a5c241c292aa34' 
  AND token = 'yL4YR/37a506c9Mqi9H5b9abYdWl2s1LIq49m4m1zBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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