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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c8c9185737ee3308cc1d4266bbc67ca8b1adecacffe92ea4953412680d87e29' 
  AND token = 'mO9zyu6W4mJWLGCfEghdhmoSCGm357NsQlSmI1aEvBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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