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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6e423fc752c43858ec3e3ea8ae94dc5c2311a8601f2cfd047a8ba571fdf460' 
  AND token = 'aybUbgdj2mNSv6+f72zakoWOHg/bG1c911WETeV0nuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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