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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a30608fdceb2872969a2ec4b84a9be40c08a1241b38de949a18c18c9b09898d' 
  AND token = 'acyJMuHb+z1C6FWFAFVXuaA3Jbvm+jGM+MC441kU3k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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