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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86355fe90149d319ea412c60f48d70aa4f18d98eb833b3095459a49cfa3ce21c' 
  AND token = 'FZWmNph8vov9UhcKmqjTd0Rj9GTGUt3FE5Nrp/7W1qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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