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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095749ed1187ecc86a11955436967ef2aa997dc99ab0752eb3884cc150b2e31c' 
  AND token = '6wb3CmLae/NJ1OaFIIUC+jX9vhB00T6cP3ouglVxjiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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