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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef70efe72073654af232e385c08e9de60981a1ccadde9bb503b93f935898569e' 
  AND token = 'WiKAxdfiuc3ZrjI/o/SUOgVRJjFEmAJC1LejmAy2sx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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