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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d944296888aee79a9324e36fcf58a3e82b257cf2d48c074414251134920537a' 
  AND token = 'GdYW6bMwAkZXp0MlgeZYpESDPk/YTMeCKzP1EmlB42M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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