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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e590785e7a6b0ea63e7b0727ca968585bc29fc7d99dadc49a38693b9fe4f8e3' 
  AND token = 'ak+ClPoZ9ZantZVPaQLZ8uSYAfGx6jvbb0ruXVgmLxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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