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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e10551e2be099e916cc26358839118e1809347ddbbf939cba8bbf39d8d1a5a' 
  AND token = 'CndjqTodWwqOvGJ0dCUKjT+JD6BSTLX4lEDArY9R/so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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