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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a33432cbd0a77e8721abeaac631ffb524153c180dd582f5b60b6e821cd373f' 
  AND token = 'OpK+o3+zwNCtDAyv93Lb+mHsgvU2GnzonS5c3lV/G8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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