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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e116fe41707d193a2efd314240d75037d9bb1440008ac41fdc52a259aca0e1' 
  AND token = 'fHXBmuhoqw2wVjXesabJVbPhmTbPzZv1AoTNI6H30Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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