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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b5968546e5f917fd377c1dd0589f653ac01f7cd88938c677827eea9f04c3504' 
  AND token = 'schzOG+9jBc2duiyihgIwaDx8Rm2q+5swXaR0gkt+mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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