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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119444fe72e5a663b5aa602c27deb4bc2dcbba4c889b290cf67d4b431fbd97bd' 
  AND token = '7m9CnbUbOCf/JPOpVdRyPLY0s2SuseV7vU2N6qOjqzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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