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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca5237b376fdddf145d4bf56199fb37c7ee519faf831b6b9c07c3b8599e8a3a' 
  AND token = 's5gb+fWlIMgUQwea8BgONLdVaG9zBbMPb1zRJJzsfIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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