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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b69a1ad509b789de8a37877a6253af59f50bfe6d6ac77b973042e51a288b75b2' 
  AND token = 'UyvtTznj+fZV8hg1RCla4adNaVx9o6B4ceh7foCCty4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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