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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '458552a363f0fe74e7e8ae4d6d59520a447ddf89f05770975afa1c5df0fe524b' 
  AND token = 'BD45uoNrCh2+iVo+yf+P+nkjB3a/GvXxKp9LrEA6inc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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