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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938d5c1250ced723be295662a36ad14f7df35b1ad19e69f139ffac4b0addb106' 
  AND token = 'p00e9/4OMOPpJ202jY+GMeNHtsqvJ1+5gAzEaCQbEqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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