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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85dc75a9cd2aca6343f9309e55a2e59374e09785359c3583173b28cb00b1ed6' 
  AND token = '4SVmgGlGGgVHojuUQ7B5Tz0ITLI7ea71Or1xUx18sa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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