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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44185c93ae28c27f0e44e1bc301974b7534c1912534508b8861f80f2226b4d66' 
  AND token = 'GpnwiY0xEK8OugNoqeTxp+McF83G8iY4K+hQvYUTO2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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