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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e635f909a9ac3c8e9e38a1940509f2c1a71c98c5e798e02795557c772a3ffc' 
  AND token = 'OH4ul9xr+iv3XUCEYqWtWhxmJlL5580M3s4VHl4P3Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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