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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60c88c32188986aa7a3ae11e5258f15265453eaec2de3f8e7701b1780f94dd8' 
  AND token = '5bQkMiQ8snQcBteQWG/zdcqLB+PZEWtjmtMaZn7zhVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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