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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576afe326f82d02f98785fa8d5f7cbca82a8ce054fb99e099e0d9660bae73f3e' 
  AND token = 'v5yTvZu8FjsUpNXFJI5LL/N1uwjAvE/xbJDCODLscLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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