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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a4d99d897ab5aa0dee05c10b67a54daf8b9a29197642fb95e791a09ad1abac' 
  AND token = 'zQvg+8ncsa9y6WQppcVo1rg8ampXWh7HKj2DAeiwZC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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