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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7ed472e82c5bdc8ecf99602c423df0c0f077b18d2630bf44ef2ec0f069d85d' 
  AND token = 'oFUn2UEvLYUsFbg6pQv/pRCgiRstxZBTCfDPciEjPZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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