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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03be194b20f1a84b487f64d55aa3c93b8533ddf12a6d0819b8adfc9813f4d2ea' 
  AND token = 'vdzsW7BxJJRjk5u3o460d60PiTOHmFX+u51tRaP3I3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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