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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc78ed08ebceaaef9e6137265935377663893d8a51ac5068f0dc4c62682ef019' 
  AND token = 'slBDewoG0pQnJLwsCtZ0+IxFpqh4EJBYtp/996TDutY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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