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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acba19ff2d8c96eff862ed9b4cda21cce72ef614b40c12e9dc3376a3eea996bc' 
  AND token = 'xNcvSuD8OByNswYC976A9lVG94IvO1vBLXrNUahdn6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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