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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecf7d3dcfb3de85ecbe6b6d5ad9f6b2fe139243a3e38c87ce33335f9985eaa7' 
  AND token = 'ABt2lZ8c2hz/6IO1RN5SfUg3dUsfRfl0hkbTCPIm7Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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