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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beff8b997109b9c7f1a003a8221be2ab1d8bbf4c20ac663bed13a841db98f5a5' 
  AND token = 'hoeWLCVRalZpvwkwhMdI6Sz3xB6NRMyzzrcI0+DoZ2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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