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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b3c494ac6b5bc1cce35bb6f9dc0bfe82d69c56ff0cd50a10ad1694da256f82' 
  AND token = '77gpuEYenBOm+PLkuBi5HS1Y2dWhK6NYswH6cjdWMcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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