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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3da3cf3c2f6dd0b37f1290405f7dd617f567f6c00d433af38f9185e68140aa0' 
  AND token = 'k2+ZVoKFpvEWUsX1UuJGttfmre3OBjES6fzlXhpVnMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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