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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e757c27e469af9c91b65a8be67d8164d76c1f4e1f71adbcb4fe11c611da1a72f' 
  AND token = '2c5Ja8v2gvDkiQONdNhGCvNlHeUCnWm76hkV+4kgZoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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