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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff548fbb4a4f6581652cb5cae9d3ba1414d3c92a03ce23d9515ae62c7dce145' 
  AND token = 'aVmskxLULoIDnHh2AFxLTGfv4lr4YTmRpUZJI8IzNfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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