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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '049d70d6628e056c16ae118bef6030bc16da94602c7c04926992bdbbfbae6397' 
  AND token = 'RBwAYIwSMg6/A/6KCKr9fSTRdavNlgoDwPWyVd865cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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