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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a741cd7cd645e0a5828d81bc0498f523097c98d7baeb05c485ce6ef2b71fc638' 
  AND token = 'ms+IueQxslSUFC8jeMUtmt8d1Z225Xszyr9YjGaIlVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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