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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd870190f6ddfd55057ec57f4eefa7304ecce19ea72c5c88b0a2805eff497c7ef' 
  AND token = 'WJeuS5aM/2AFtk3O0STW0DOOIXZ01f3gteaNvfMkK6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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