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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a89e273e891cea0369ea5686870219f6d7d0d270115d833fd710cfca2ae29d1' 
  AND token = 'A/A0nfnroCL/RpdI4oPUW74bJ99WpltTRSQKfxTz6x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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