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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1c24fb97ba4c0f9141d917a59f686808791a0ec88ee7058d3800203d3cfe0b' 
  AND token = '8DOlfyvUnSLty7SCkmcPV6bLjrlwhzFq29JH8Iws3WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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