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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9acfc1fe83447d2012bb1658070b74b9dd86163555acd3223a337f027c8fa48' 
  AND token = '8TgS3fZbALmjTDvSIyRoH/KKsl75GkmPx2nlsiViLWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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